This traditional leather-tanning process hasn't changed since the 11th century

Tanners at the Chouara Tannery in Morocco have been transforming animal hides into leather since the 11th century. The tanning process has gone unchanged since then, but it relies on heavy chemicals that threaten the health of workers. Some say they are not willing to take that risk. We traveled to the world’s oldest leather tannery in Fez, Morocco to find out how this ancient craft is still standing.